Home / 8,421.37-12,629.32-3,978.35

Finding the Fourth Proportional to 8,421.37, 12,629.32 and 3,978.35

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Solution

The fourth proportional to 8,421.37, 12,629.32 and 3,978.35 is: 5,966.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.37 : 12,629.32 = 3,978.35 : x
  2. Step 2: Convert to fraction form
    8,421.37/12,629.32 = 3,978.35/x
  3. Step 3: Cross multiply
    8,421.37x = 12,629.32 × 3,978.35
  4. Step 4: Simplify right side
    8,421.37x = 50,243,772.18
  5. Step 5: Solve for x
    x = 50,243,772.18/8,421.37
  6. Step 6: Final answer
    x = 5,966.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.